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The source code for a simple computer program written in the C programming language which, when compiled and run, will give the output "Hello, world!".
A programming language is a system of notation for writing computer programs. Most programming languages are text-based formal languages, but they can also be graphical. They are a kind of computer language.
The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning), which are usually defined by a formal language. Some languages are defined by a specification document (for example, the C programming language is specified by an ISO standard) while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common.